It's not the oil then. Most synthetic oils you can go to 10-15k hell I've even seen oils that say 20-25k for chabge intervals. I always change mine at 5k and around 2500-3000 miles I change the oil filter because I'm ocd. I don't think you changing your oil for a year caused this man. It may just be from general ware and tare and something needs replaced. On the brightside you could always k24 swap it lol. I k24 swapped my 06 si and it's a whole different animal now lol.12,000 kms or 7,500 miles.